ncurses 5.9 - patch 20130406

[ncurses.git] / ncurses / base / lib_overlay.c

diff --git a/ncurses/base/lib_overlay.c b/ncurses/base/lib_overlay.c
index 16591ac08b3ac5d743dc6578fdf890037f048e63..a206248a1e74ee3afc18d14508d43bbee49d53d4 100644 (file)
--- a/ncurses/base/lib_overlay.c
+++ b/ncurses/base/lib_overlay.c
@@ -40,7 +40,7 @@
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: lib_overlay.c,v 1.30 2013/01/19 22:31:19 tom Exp $")
+MODULE_ID("$Id: lib_overlay.c,v 1.31 2013/04/06 23:47:13 tom Exp $")
 
 static int
 overlap(const WINDOW *const src, WINDOW *const dst, int const flag)
@@ -151,7 +151,10 @@ copywin(const WINDOW *src, WINDOW *dst,
        dminrow, dmincol,
        dmaxrow, dmaxcol, over));
 
-    if (src && dst) {
+    if (src != 0
+       && dst != 0
+       && dmaxrow >= dminrow
+       && dmaxcol >= dmincol) {
        _nc_lock_global(curses);
 
        bk = AttrOf(dst->_nc_bkgd);